Alert archive / Arizona / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Arizona, 2010

284 severe thunderstorm warnings in 2010. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.

Severe Thunderstorm Warnings by county

Each county as a circle sized by its count in 2010. Tap one for its archive.

Severe Thunderstorm Warnings: 284
Busiest month: August100 severe thunderstorm warnings
Busiest day: October 6, 201036 severe thunderstorm warnings

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

72 of 285 severe thunderstorm warnings covering Arizona in 2010 had a qualifying storm report inside them; 136 of 220 hail, wind and damage reports fell inside a warning, on average 20 minutes after it went out.

Arizona, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	285	72	75%	220	62%	20 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Phoenix, AZ: severe thunderstorm warnings	82	36	56%	113	69%	19 min
NWS Las Vegas, NV: severe thunderstorm warnings	66	6	91%	43	35%	15 min
NWS Tucson, AZ: severe thunderstorm warnings	97	28	71%	64	75%	23 min
NWS Flagstaff, AZ: severe thunderstorm warnings	76	6	92%	26	27%	18 min

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

The alerts

Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Counties	Lasted
Jan 21, 4:31 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	59 min
Jan 21, 4:47 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	45 min
Jan 21, 5:02 PM MST	Severe Thunderstorm Warning	VEF	Mohave	29 min
Jan 21, 5:30 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	17 min
Jan 21, 6:22 PM MST	Severe Thunderstorm Warning	PSR	Yuma	53 min
Jan 21, 7:27 PM MST	Severe Thunderstorm Warning	TWC	Pima	63 min
Jan 21, 8:31 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	59 min
Jan 21, 9:08 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	52 min
Jan 21, 9:30 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	60 min
Jan 21, 9:49 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Navajo	41 min
Jan 21, 10:33 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	57 min
Jan 21, 11:26 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	49 min
Mar 9, 12:29 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	46 min
Mar 9, 1:00 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	38 min
Jun 6, 4:59 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	31 min
Jun 11, 7:42 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	21 min
Jul 12, 3:44 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Navajo	31 min
Jul 12, 4:15 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Navajo	30 min
Jul 15, 5:40 PM MST	Severe Thunderstorm Warning	PSR	Gila	65 min
Jul 15, 5:46 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	46 min
Jul 15, 6:02 PM MST	Severe Thunderstorm Warning	TWC	Pima	21 min
Jul 16, 1:17 PM MST	Severe Thunderstorm Warning	TWC	Pima	43 min
Jul 16, 2:58 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Jul 16, 5:09 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	21 min
Jul 16, 5:50 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	40 min
Jul 17, 1:48 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	42 min
Jul 17, 1:54 PM MST	Severe Thunderstorm Warning	TWC	Cochise	51 min
Jul 17, 2:14 PM MST	Severe Thunderstorm Warning	TWC	Cochise	46 min
Jul 17, 2:33 PM MST	Severe Thunderstorm Warning	TWC	Graham	42 min
Jul 17, 2:40 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	50 min
Jul 17, 3:25 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	35 min
Jul 17, 3:45 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	60 min
Jul 17, 4:35 PM MST	Severe Thunderstorm Warning	TWC	Pima	55 min
Jul 17, 4:37 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	23 min
Jul 17, 5:29 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Jul 17, 5:29 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Jul 17, 6:12 PM MST	Severe Thunderstorm Warning	TWC	Pima	63 min
Jul 17, 6:30 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	30 min
Jul 17, 7:00 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	30 min
Jul 17, 7:14 PM MST	Severe Thunderstorm Warning	TWC	Pima	27 min
Jul 17, 9:23 PM MST	Severe Thunderstorm Warning	TWC	Pinal	52 min
Jul 18, 3:33 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	27 min
Jul 18, 3:52 PM MST	Severe Thunderstorm Warning	PSR	Gila	53 min
Jul 18, 3:57 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	63 min
Jul 18, 5:00 PM MST	Severe Thunderstorm Warning	TWC	Cochise	30 min
Jul 18, 5:27 PM MST	Severe Thunderstorm Warning	TWC	Cochise	48 min
Jul 18, 5:42 PM MST	Severe Thunderstorm Warning	PSR	Gila	63 min
Jul 18, 8:23 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	37 min
Jul 19, 4:22 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	53 min
Jul 19, 5:03 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Jul 19, 5:45 PM MST	Severe Thunderstorm Warning	TWC	Cochise	44 min
Jul 19, 5:59 PM MST	Severe Thunderstorm Warning	TWC	Cochise	61 min
Jul 19, 6:25 PM MST	Severe Thunderstorm Warning	TWC	Cochise	50 min
Jul 19, 7:14 PM MST	Severe Thunderstorm Warning	TWC	Cochise	46 min
Jul 20, 1:20 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	55 min
Jul 20, 7:40 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	50 min
Jul 21, 11:28 AM MST	Severe Thunderstorm Warning	TWC	Cochise	62 min
Jul 21, 1:00 PM MST	Severe Thunderstorm Warning	TWC	Cochise	45 min
Jul 22, 4:17 PM MST	Severe Thunderstorm Warning	TWC	Pima	28 min
Jul 23, 12:46 PM MST	Severe Thunderstorm Warning	FGZ	Gila	44 min
Jul 23, 12:48 PM MST	Severe Thunderstorm Warning	VEF	Mohave	42 min
Jul 23, 2:33 PM MST	Severe Thunderstorm Warning	FGZ	Gila	42 min
Jul 23, 2:44 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	61 min
Jul 23, 2:47 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	43 min
Jul 23, 3:48 PM MST	Severe Thunderstorm Warning	PSR	Gila	42 min
Jul 23, 5:43 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	18 min
Jul 24, 2:58 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	32 min
Jul 24, 6:20 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	40 min
Jul 25, 12:14 PM MST	Severe Thunderstorm Warning	TWC	Cochise	31 min
Jul 25, 3:17 PM MST	Severe Thunderstorm Warning	TWC	Cochise	43 min
Jul 28, 4:11 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	37 min
Jul 28, 4:34 PM MST	Severe Thunderstorm Warning	PSR	Pinal	56 min
Jul 28, 4:59 PM MST	Severe Thunderstorm Warning	PSR	Gila	39 min
Jul 28, 6:30 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	45 min
Jul 29, 1:19 PM MST	Severe Thunderstorm Warning	TWC	Pinal	26 min
Jul 29, 1:29 PM MST	Severe Thunderstorm Warning	PSR	Pinal	61 min
Jul 29, 2:56 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	34 min
Jul 29, 3:46 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	59 min
Jul 29, 4:02 PM MST	Severe Thunderstorm Warning	PSR	La Paz	31 min
Jul 29, 4:24 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	51 min
Jul 29, 4:47 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	45 min
Jul 29, 4:56 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	64 min
Jul 29, 5:15 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	19 min
Jul 29, 5:52 PM MST	Severe Thunderstorm Warning	TWC	Cochise	38 min
Jul 29, 5:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise	35 min
Jul 29, 11:19 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Jul 30, 5:41 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	34 min
Aug 3, 12:38 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	37 min
Aug 3, 1:11 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	22 min
Aug 5, 2:17 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	16 min
Aug 5, 4:06 PM MST	Severe Thunderstorm Warning	TWC	Cochise	24 min
Aug 5, 4:55 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	35 min
Aug 5, 5:49 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	26 min
Aug 5, 6:08 PM MST	Severe Thunderstorm Warning	FGZ	Apache	37 min
Aug 5, 6:19 PM MST	Severe Thunderstorm Warning	TWC	Pima	26 min
Aug 5, 6:25 PM MST	Severe Thunderstorm Warning	FGZ	Apache	22 min
Aug 6, 3:33 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	27 min
Aug 6, 3:34 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Aug 6, 3:58 PM MST	Severe Thunderstorm Warning	TWC	Cochise	47 min
Aug 6, 5:18 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Aug 6, 5:58 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	47 min
Aug 8, 1:26 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	71 min
Aug 8, 1:37 PM MST	Severe Thunderstorm Warning	VEF	Mohave	38 min
Aug 8, 2:22 PM MST	Severe Thunderstorm Warning	VEF	Mohave	38 min
Aug 8, 3:01 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	14 min
Aug 8, 3:49 PM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Aug 15, 3:55 PM MST	Severe Thunderstorm Warning	TWC	Pima	35 min
Aug 15, 4:20 PM MST	Severe Thunderstorm Warning	PSR	Gila	25 min
Aug 15, 4:26 PM MST	Severe Thunderstorm Warning	TWC	Pima	37 min
Aug 15, 5:42 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	38 min
Aug 15, 7:44 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	46 min
Aug 15, 10:26 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	49 min
Aug 17, 12:21 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	24 min
Aug 17, 1:07 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	23 min
Aug 17, 1:09 PM MST	Severe Thunderstorm Warning	TWC	Pima	66 min
Aug 17, 1:58 PM MST	Severe Thunderstorm Warning	VEF	Mohave	47 min
Aug 17, 2:31 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	38 min
Aug 17, 2:35 PM MST	Severe Thunderstorm Warning	TWC	Pima	25 min
Aug 17, 2:56 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	34 min
Aug 17, 3:35 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	25 min
Aug 17, 3:57 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	63 min
Aug 17, 5:00 PM MST	Severe Thunderstorm Warning	TWC	Graham	30 min
Aug 17, 5:09 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	51 min
Aug 17, 5:11 PM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Aug 17, 5:23 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	37 min
Aug 17, 5:48 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	27 min
Aug 17, 6:00 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	45 min
Aug 18, 5:18 PM MST	Severe Thunderstorm Warning	FGZ	Apache	27 min
Aug 21, 12:58 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	32 min
Aug 21, 5:07 PM MST	Severe Thunderstorm Warning	FGZ	Gila	38 min
Aug 21, 5:07 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	23 min
Aug 21, 5:36 PM MST	Severe Thunderstorm Warning	PSR	Gila	24 min
Aug 21, 5:43 PM MST	Severe Thunderstorm Warning	FGZ	Gila	32 min
Aug 23, 12:46 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	44 min
Aug 23, 2:01 PM MST	Severe Thunderstorm Warning	TWC	Cochise	49 min
Aug 23, 3:13 PM MST	Severe Thunderstorm Warning	TWC	Cochise	62 min
Aug 23, 3:34 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Aug 24, 2:21 PM MST	Severe Thunderstorm Warning	TWC	Pinal	39 min
Aug 24, 2:36 PM MST	Severe Thunderstorm Warning	PSR	La Paz	39 min
Aug 24, 2:39 PM MST	Severe Thunderstorm Warning	VEF	Mohave	32 min
Aug 24, 2:48 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Aug 24, 2:57 PM MST	Severe Thunderstorm Warning	TWC	Pinal	33 min
Aug 24, 3:09 PM MST	Severe Thunderstorm Warning	VEF	Mohave	21 min
Aug 24, 3:30 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	45 min
Aug 24, 3:32 PM MST	Severe Thunderstorm Warning	TWC	Pima	58 min
Aug 24, 3:35 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	55 min
Aug 24, 4:12 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	48 min
Aug 24, 4:45 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	60 min
Aug 24, 4:52 PM MST	Severe Thunderstorm Warning	TWC	Graham	41 min
Aug 24, 4:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	38 min
Aug 24, 5:20 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	55 min
Aug 24, 5:37 PM MST	Severe Thunderstorm Warning	PSR	Pinal	38 min
Aug 24, 5:38 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Yuma	52 min
Aug 24, 6:43 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	62 min
Aug 24, 6:46 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	44 min
Aug 24, 6:58 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	45 min
Aug 25, 5:12 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	33 min
Aug 26, 1:49 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	56 min
Aug 26, 7:32 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	58 min
Aug 27, 4:26 PM MST	Severe Thunderstorm Warning	PSR	Yuma	64 min
Aug 27, 5:16 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	59 min
Aug 27, 7:42 PM MST	Severe Thunderstorm Warning	PSR	La Paz	58 min
Aug 27, 8:06 PM MST	Severe Thunderstorm Warning	VEF	Mohave	39 min
Aug 27, 8:38 PM MST	Severe Thunderstorm Warning	VEF	Mohave	52 min
Aug 27, 9:19 PM MST	Severe Thunderstorm Warning	VEF	Mohave	28 min
Aug 27, 9:30 PM MST	Severe Thunderstorm Warning	VEF	Mohave	30 min
Aug 27, 9:32 PM MST	Severe Thunderstorm Warning	VEF	Mohave	43 min
Aug 27, 10:19 PM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Aug 27, 10:39 PM MST	Severe Thunderstorm Warning	VEF	Mohave	51 min
Aug 27, 11:25 PM MST	Severe Thunderstorm Warning	VEF	Mohave	35 min
Aug 28, 2:11 PM MST	Severe Thunderstorm Warning	TWC	Pima	34 min
Aug 28, 2:37 PM MST	Severe Thunderstorm Warning	TWC	Pima	38 min
Aug 28, 3:10 PM MST	Severe Thunderstorm Warning	TWC	Pinal	50 min
Aug 28, 4:45 PM MST	Severe Thunderstorm Warning	TWC	Pima	30 min
Aug 28, 4:56 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	64 min
Aug 28, 4:57 PM MST	Severe Thunderstorm Warning	TWC	Pima	28 min
Aug 28, 5:16 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	44 min
Aug 28, 5:57 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	37 min
Aug 28, 6:23 PM MST	Severe Thunderstorm Warning	PSR	Pinal	37 min
Aug 28, 6:35 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Aug 28, 6:50 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Aug 28, 7:03 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	57 min
Aug 28, 7:03 PM MST	Severe Thunderstorm Warning	TWC	Pinal	27 min
Aug 28, 7:15 PM MST	Severe Thunderstorm Warning	TWC	Pima	45 min
Aug 28, 7:24 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	36 min
Aug 28, 7:55 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	35 min
Aug 29, 12:32 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	43 min
Sep 3, 3:11 PM MST	Severe Thunderstorm Warning	TWC	Pima	49 min
Sep 3, 3:52 PM MST	Severe Thunderstorm Warning	TWC	Pima	53 min
Sep 21, 4:35 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	40 min
Oct 2, 2:57 PM MST	Severe Thunderstorm Warning	TWC	Pima	30 min
Oct 2, 3:44 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	61 min
Oct 3, 1:32 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	28 min
Oct 3, 2:00 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	45 min
Oct 3, 3:23 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	22 min
Oct 4, 9:49 AM MST	Severe Thunderstorm Warning	VEF	Mohave	26 min
Oct 4, 11:33 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	27 min
Oct 4, 2:19 PM MST	Severe Thunderstorm Warning	VEF	Mohave	29 min
Oct 4, 2:25 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	65 min
Oct 4, 2:46 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Maricopa, Yuma	44 min
Oct 4, 2:47 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	58 min
Oct 4, 2:53 PM MST	Severe Thunderstorm Warning	VEF	Mohave	30 min
Oct 4, 5:07 PM MST	Severe Thunderstorm Warning	VEF	Mohave	38 min
Oct 4, 5:40 PM MST	Severe Thunderstorm Warning	PSR	Pinal	65 min
Oct 4, 5:51 PM MST	Severe Thunderstorm Warning	PSR	La Paz	54 min
Oct 4, 6:18 PM MST	Severe Thunderstorm Warning	VEF	Mohave	36 min
Oct 4, 6:27 PM MST	Severe Thunderstorm Warning	VEF	Mohave	48 min
Oct 5, 4:24 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	35 min
Oct 5, 9:44 AM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Oct 5, 11:39 AM MST	Severe Thunderstorm Warning	TWC	Pima	30 min
Oct 5, 11:43 AM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	62 min
Oct 5, 11:56 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	34 min
Oct 5, 12:21 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	39 min
Oct 5, 12:23 PM MST	Severe Thunderstorm Warning	PSR	Pinal	37 min
Oct 5, 12:27 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	63 min
Oct 5, 12:48 PM MST	Severe Thunderstorm Warning	TWC	Pinal	27 min
Oct 5, 1:04 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	26 min
Oct 5, 1:08 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	37 min
Oct 5, 1:14 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	61 min
Oct 5, 1:17 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	58 min
Oct 5, 1:32 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	58 min
Oct 5, 2:12 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa	33 min
Oct 5, 2:23 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	35 min
Oct 5, 2:47 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	58 min
Oct 5, 2:58 PM MST	Severe Thunderstorm Warning	VEF	Mohave	32 min
Oct 5, 3:10 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	65 min
Oct 5, 3:35 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	55 min
Oct 5, 3:43 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	32 min
Oct 5, 3:46 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	59 min
Oct 5, 3:51 PM MST	Severe Thunderstorm Warning	TWC	Pima	24 min
Oct 5, 4:08 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	52 min
Oct 5, 4:28 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	23 min
Oct 5, 4:52 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	53 min
Oct 5, 6:27 PM MST	Severe Thunderstorm Warning	TWC	Pima	33 min
Oct 5, 6:55 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	35 min
Oct 5, 7:26 PM MST	Severe Thunderstorm Warning	TWC	Pinal	19 min
Oct 5, 7:30 PM MST	Severe Thunderstorm Warning	PSR	Pinal	45 min
Oct 5, 7:52 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	38 min
Oct 5, 8:30 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	55 min
Oct 5, 9:26 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	19 min
Oct 5, 9:57 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	18 min
Oct 6, 12:09 AM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	66 min
Oct 6, 12:34 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	26 min
Oct 6, 1:08 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	22 min
Oct 6, 1:33 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	12 min
Oct 6, 3:40 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Oct 6, 5:30 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	45 min
Oct 6, 6:36 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	39 min
Oct 6, 6:58 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	32 min
Oct 6, 7:42 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	33 min
Oct 6, 7:46 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	44 min
Oct 6, 8:06 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	24 min
Oct 6, 8:19 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	26 min
Oct 6, 8:19 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	26 min
Oct 6, 8:49 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	26 min
Oct 6, 9:13 AM MST	Severe Thunderstorm Warning	VEF	Mohave	37 min
Oct 6, 9:25 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	35 min
Oct 6, 10:00 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	45 min
Oct 6, 10:13 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	62 min
Oct 6, 10:14 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	46 min
Oct 6, 10:32 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	43 min
Oct 6, 11:15 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	45 min
Oct 6, 12:01 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	44 min
Oct 6, 1:15 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	31 min
Oct 6, 1:17 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	43 min
Oct 6, 1:17 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	24 min
Oct 6, 1:39 PM MST	Severe Thunderstorm Warning	FGZ	Apache	36 min
Oct 6, 2:03 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	19 min
Oct 6, 2:16 PM MST	Severe Thunderstorm Warning	FGZ	Apache	14 min
Oct 15, 3:09 PM MST	Severe Thunderstorm Warning	TWC	Pima	51 min
Oct 18, 3:11 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	34 min
Oct 18, 6:09 PM MST	Severe Thunderstorm Warning	VEF	Mohave	36 min
Oct 19, 2:57 PM MST	Severe Thunderstorm Warning	VEF	Mohave	33 min
Oct 19, 8:33 PM MST	Severe Thunderstorm Warning	VEF	Mohave	42 min
Oct 20, 12:23 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	22 min
Oct 20, 1:31 PM MST	Severe Thunderstorm Warning	VEF	Mohave	44 min
Oct 20, 1:48 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	42 min
Oct 20, 2:31 PM MST	Severe Thunderstorm Warning	VEF	Mohave	23 min
Oct 20, 2:54 PM MST	Severe Thunderstorm Warning	VEF	Mohave	51 min
Oct 20, 3:31 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	29 min
Oct 20, 3:33 PM MST	Severe Thunderstorm Warning	VEF	Mohave	27 min
Oct 20, 5:32 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	28 min
Oct 20, 5:55 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	35 min
Dec 22, 4:24 PM MST	Severe Thunderstorm Warning	VEF	Mohave	51 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2009 2011

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.